Combination mold



new and useful Improvements in Combi- 1 each other.

arr sa e ARNOLD L. SCHAVOIR, 0F STAMFORD, CONNECTICUT.

' oo-innmarron norm.

nterest.

I Specification of Letters Patent.

Patented Feb. 21,. 11922.

Application filed Apri128, 1921. Serial No. ceases.

To all whom it may concern:

Be it known that ARNoLn L; SoHAvoIR, a citizen of the United States, andresident of Stamford, in the county of Fairfield and" State ofConnecticut, has invented certain nation Molds, of whichthe following isa specification.

This invention relates to a combination mold especially useful for thepurpose of manufacturing in quantity rubber or celluloid articles, suchas balls, dolls, and the like.

The principal object of the invention is to provide an improved mold ofthe present character which will be of simple, economical and durableconstruction, will be light in weight so that it can be easily andconveniently manipulated in use, and will be capable of efficiently andquickly performing the function for which intended, as more fullyhereinafter to appear.

Other important objects and advantages .will become apparent as thedescription proceeds. I

In the accompanying drawing forming a part of this specification, c

Fig. 1 is a top plan view of the novel combination mold; and

Fig. 2 is a sectional view thereof on line 2'2 in Fig. 1 and looking inthe direction of the arrows. g By reference to the drawing, .it will beseen that the combination mold consists of a lower section 10 and anupper section 11 which may be approximate duplicates of The sections arehingedly connected to each other in any preferred manner, as by means ofarms, denoted by 12 and 13, respectively, extending rearwardly from thesections and pivoted upon pins 14:, as will be understood.

- Each section consists of a casting of suitable material, such as ironor steel, having a base 15, side and end walls, denoted by 16 and 17respectively, and a base arranged opposite base 15 and constituting aseries of half-molds 18 of any, preferred configuration, depending uponthe shape of the article to be formed, said base, half-molds, side andend walls providing a completely enclosed chamber 19 in close proximityto the half-molds. and partly surrounding the same. y

In the case of each section, base 15 and the extremities'of thehalf-molds, denoted by 20, are parallel with each other, all of saidextremities terminating in the same plane, as is obvious.

To strengthen bases 15, without adding considerably to their weight,they are each preferably provided with longitudinally and laterallyextending ribs, denoted by 21 and 22, respectively, and to insure thepositions of the half-molds, preferably cylindrical supports 23 areincorporated in the castings, said supports extending through chamber 19and having their opposite ends, respectively, terminating in base 15 andthehalfmolds.

Mechanism is provided for swinging the upper mold section on its hingeand toward and from the lower mold section. As shown, this mechanismconsists of a bar 24 secured to base 15 ofthe. upper section and havingthereon a handle 25 arranged at the front of the combination mold and aweight- 26 arranged at the rear thereof, said weight being for theobvious purpose of counterbalancing a part of the weight of the uppersection.

It is to be here remarked that arms 12 and 13 and pins 14 are soarranged that when the upper and lower sections are moved toward eachother, as they are shown in the drawing, the extremities 20 of thehalf-molds of the different sections firmly and evenly engage each otherto supply complete and independent molds, best shown in Fig. 2, eachconsisting of two half-molds. The sections can be locked together in anypreferred manner. As shown, I provide a series of clamps for thispurpose and locate the same at spaced apart positions about the lowerand upper sections, each clamp preferably consisting of a pair ofaligning U-shaped lugs, denoted by 27 and 28, respectively, oneextending from the lower and one from the upper section, a cross-pin 29imbedded in the legs of lug 27 a link 30 pivotally supported at itslowgr end upon cross-pin 29 and extending between the legs of lug 28, 11crosspin 31 upon which the upper'end of the link is pivoted, and a lever32 having cam faced arms 33 pivoted upon cross-pin 31 and adapted tobear against the upper faces of the legs of U shaped lug 28. It will beapparent that to unlock the sections in order that they can be movedapart, all that is necessary is to first swing ion then swing the links30 on the cross-pins 29 and away from the combination mold. To

look the sections the operations 'just described are reversed.

As very clearly disclosed, the chamber of each mold section is providedwith an inlet chambers.

The mold performs its work in the manner now to be set forth. While theupper section is in open position, a piece of material of desirableshape and proper consistency is placed-in each of-the haIf-molds of thelower section. .The upper section is then moved .;against the lowersection by means of the handle 25 and locked by means of theclamps.Steam under the desired pressure is now introduced into both of thechambers 19. The steam partially encloses the half-molds, as will beevident, and supplies heat to the material. Afterthe steam has properlydone its work as just described, the chambers are emptied of steam, andcold water or cold air is then inserted to cool off the half-molds andcause the formed articles to set: At the end of the setting operationtheclamps are released and the upper section is moved to open order thatthe articles ,can be llfted from the ha-lf-molds of the lower section.

In the manufacture of hollow articles the piece of material placed ineach half-mold has in its interior some suitable substance eous.

which at ordinary temperatures is 'nongaseous but at higher temperaturesis gas- As soon as steam is introduced in the manner already set forth,the substance at the interior of each piece of material almostimmediately becomes gaseous and causes the material to expand to fillthe comi plete molds, thus forming hollow articlesof the shape of saidmolds.

In accordance with common practice the working faces of the half-moldsmay consist of relatively soft metal capable of being more accuratelyformed to give better results.

I It is especially called to attention that the combination mold of thisinvention is comparatively light in weight, and that the upper sectionthereof can be moved to open osition in v and closed position with but aminimum of effort. The material of the half-molds may,

in the construction shown and described, be of comparatively thin metaland the steam and coldwater or cold air in the chamberscan to aconsiderable extent surround the half-molds, thus making the interior ofthe complete molds quite sensitive to changes of temperature in thechambers. The mold of the invention, therefore, is adequately capable ofefficiently and uickly functioning to produce t e result esiredimmanufacturing articles omposed of rubber, celluloid or other materialswhich can be put into molds in a plastic state.

Having thus fully described the inven .tion, what I claim as new anddesire to secure by Letters Patent, is:

1. A combination mold comprising a pair of sections each consisting of acasting having side and end walls and a pair-of bases, one of said basesof each section constituting a series of half-molds, said bases, sideand end walls of each section enclosing a chamber partially surroundingsaid halfmolds, and said chambers having. openings to receive hot andcold fluids;

2. A combination mold comprising a pair of hingedly connected sectionseach consisting of a casting having side and end walls and a pair ofbases, one of said bases of each section constituting a series'of halfmolds having extremities lying in the same plane, and said castings eachenclosing a chamber partially surrounding said half-molds and adapted toreceive, hot and cold fluids, means for moving said sections together sothat the extremities of the half-molds of the different sections canengage each other to form,

bases defining a completely enclosed cham-' ber partially surroundingsaid half-molds, and supports for said half-molds and extending throughsaid chamber.

Signed at Stamford, in the county of Fairfield, and State ofConnecticut. this 22nd day of April, A. D. 1921.

' ARNOLD L. SCHAVOIR.

